4. Place sauteed onion mixture in center of patty and top with 1/2 slice provolone. Wrap the sides of the burger up on top of the mixture and pinch all seams closed well, or they will open when cooking.

5. Place on grill, seamed side down first. Cook for about 8 minutes on each side, to ensure meat is fully cooked on inside. 2 minutes prior to removing burgers from grill, place full slice of provolone on top to melt.